[blender] preview: use Freestyle for line art shading #2074
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Description
A regression on the
ScenePreview
node was introduced in this PR: theline_art
shading method was not working properly with Cycles.In this PR we fix this regression by replacing the former method with a new one that provides more flexibility for potential future refinements.
For that we simply use the Freestyle renderer: https://docs.blender.org/manual/fr/dev/render/freestyle/introduction.html